package com.bidevalution.support.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import lombok.extern.log4j.Log4j2;

import javax.imageio.ImageIO;
import javax.swing.filechooser.FileSystemView;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

@Log4j2
public class QrCodeUtil {
	public static void main(String[] args) {
		String url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxacecec04c6af72b1&redirect_uri=http://24v775769h.qicp.vip/bid-evalution/bidroom/location&response_type=code&scope=snsapi_base&state=123#wechat_redirect";
		String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";
		String fileName = "temp.jpg";
		//createQrCode(url, path, fileName);
	}

	public File createQrCode(String url, String path, String fileName) {
		try {
			Map<EncodeHintType, String> hints = new HashMap<>();
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
			BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);
			File file = new File(path, fileName);
			if (file.exists()
					|| ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) {
				writeToFile(bitMatrix, "jpg", file);
				return file;
			}

		} catch (Exception e) {
            log.error(e.getMessage(), e);
		}
		return null;
	}

	void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format " + format + " to " + file);
		}
	}

	void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, stream)) {
			throw new IOException("Could not write an image of format " + format);
		}
	}

	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;

	private BufferedImage toBufferedImage(BitMatrix matrix) {
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
			}
		}
		return image;
	}
}
